#include <fstream>
using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int cmmdc (int a, int b)
{
    int r;
    while (b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main ()
{
    int x,a,b;
    fin >> x;
    for (int i=1; i<=x; i++)
    {
        fin >> a >> b;
        fout << cmmdc(a,b) << '\n';
    }

    fin.close();
    fout.close();
    return 0;
}